cufflinks

The argument in the future of satellite communications, laser communications and radio communications, in terms of performance, size, weight, power and transmission rate advantage. The system technical requirements at least one communication terminal in space, completed in mid-1995 developed 1998 first flight test, the rate of 750Mbps data transfer. LCDS system used in satellite links that exist are mainly: (1) satellite link network between the nodes of long-range duplex communication; (2) wide-angle optical targeting positioning; (3) high-speed high bit rate communications; (4) in the uplink and downlink communication link cloud dispersion and attenuation effects. NASA to encourage industry participation in the development of laser satellite communications technologies, has entered into two contracts with industry. It is the double-colored 30mw green laser pointer.
The tasks include estimating future space laser satellite communications market, the development of laser satellite communications programs, public spaces and the launch vehicle (including satellites), and developed a laser satellite communications plan in the future. The purpose of the two contracts is the development of laser satellite communications market, and is ready for commercial satellite communications network in the future. NASA also some key technologies of the free-space laser communication and presentation system at the same time, the main light communication demonstration system of OCD (Optical Communication Demonstration), air-to-ground demonstration system, TOPSAT (TOP graphical mapping Satellite) system, atmospheric visibility monitoring Plan (AVMP) and other. This kind of 30mw green laser pointer  has the red green type of laser pointer.
In addition, NASA also conducted a number of key technologies: small-aperture optical antenna developed; high-power laser source and the modulation method; high sensitivity receiver near the quantum limit; fast and accurate ATP (Acquisition, the Tracking, Position) technology. NASA also supports the Jet Propulsion Lab (JPL) developed laser satellite communications plan, including the development of high-energy (3.5W) Nd: YAG laser communications equipment, devices equipped with a narrowband laser filter to save the image function, used to support NASA implementation of the future tasks, and plans to develop the ground and in space laser satellite communications tracking network. JPL also developed by the laser satellite communications equipment, called laser communication verification is a relatively simple laser systems. It means the customer can choose the different combined type of 50mw green laser.
Mainly used for communication between the space shuttle and the ground, the transmission rate of 100Mbps. Also being developed transfer rate of 500Mbps laser communications equipment. Ministry of the U.S. Air Force funded research to select the best communication wavelength in the mid-1970s, and in the ACTS spacecraft equipped with a semiconductor laser transmitter to establish a pre-research work between the spacecraft and ground-heterodyne receiver contact. At present, it is the most representative system is the LITE (Laser Intersatellite Transmission Experiment), the U.S. Air Force from 1985, the Ministry of start LITE project. Massachusetts Institute of Technology Lincoln Laboratory study of high bit rate data transmission, high sensitivity inspection. For example, if it is the red green 30mw green laser pointer.
ThermoTrex companies tracking and targeting technologies, including the background radiation of the sun and other high inhibitory effect of atomic filter. The goal of this study is between GEO and LEO satellite laser communication between the high-altitude aircraft and ground, the transmission rate of 220Mbps. Astro of Terra also funding from the Air Force laser communications technology, it developed the system load in 1988, the launch of STRV-2 satellite. The transmission bit rate of the system as follows: upstream 155Mbps; downstream 1.24Gbps. In addition, the Air force value of the laser communication experiment, the main communication between AWACS and fighter, its range of 8-64km, with 50 goals, communication, and transmission rate are 2Mbps. The green laser beam light will come out of the other hole of 30mw green laser pointer.